Traffic signal



c. A. B. HALVORSON, JR

TRAFFIC S IGNAL Filed Jan, 24, 1925 2 Sheets-Sheet 1 lnvehtbr": ICromwell AJB, Halvorson, Jr,

HIS Attorneg.

July 20 1926. 1,593,402

c. A. B. HALVORSON, JR

TRAFFIC S IGNAL Filed Jan. 1925 2 Sheecs-Sheet 2 Cromwell A. B.Halvorson, Jr,

His Attorneg Patented July 20, 1926.

UNITED STATES PATENT OFFICE.

CROMWELL A. B. HALVORSON, JR., OF LYNN, MASSACHUSETTS, ASSIGNOR TO GEN-ERAL ELECTRIC, COMPANY, A CORPORATION OF NEW YQRK.

TRAFFIC SIGNAL.

Application filed January 24, 1925. Serial No. 4,587..

My invention relates to signals and projectors. More particularly itrelates to signals adapted for use in'connection with street and highwaytraflicsignals.

In connection with signals of this type, is diflicult for the observerto determine the condition of the signal if he is to one side of thesignal or if he is too near and under the signal; i. e. if he is toonear the plane which passes through the lens of the signal. It is veryoften the case that traffic signals are located quite high over thesurface of the road, in which case the foregoing is particularly true.Therefore, if a vehicle driver is considerably to one side, it isdifiicult for him to determine the condition of the signal, or if he isquite near the road intersection where the signal is located, the sameobjection is found.

It is an object of my invention to provide an improved form of signalwhich will enable the signal operations to be observed with certaintyeven though the observer is considerably out of line with the signal.

It is also an object to provide an improved form of hood for the signalin order that the rays of light may be spread both laterally anddownward in order that the range of the rays of the signal may bebroadened.

The means for accomplishing the foregoing are hereinafter more fully setforth and claimed, reference being had to the accompanying drawing inwhich Fig. 1 shows one form of traffic signaling unit in which eachlight signal is provided with the improved form of hood of my invention.

Fig. 2 is an enlarged view of the hood. As shown, the hood is providedwith two groups of corrugations, one group extending longitudinally ofthe hood and the other group extending transversely. Fig. 3 illustratesdiagrammatically how the hood affects the rays so as to spread themdownwardly and also laterally. Fig. 4 is a section across thelongitudinal corrugations and represents diagrammatically how the raysare spread laterally by the longitudinal corrugations. Fig. 5 is asection across the hood showing how the transverse corrugations spreadthe rays downwardly.

Referring more in detail to the drawings, it will be seen that the unit,Fig. 1, is provided with a number of light signals such .in Fig. 2, thelongitudinal corrugations 5 extend from the front toward the back of thehood and as far as the transverse corrugations 6 which latter aregrouped at the back end of the hood.

Associated with each signal, and therefore with each hood, there is, ofcourse, the usual source of light 8', Fig. 3. The rays of light from thesource which strike the longitudinal corrugations are spread laterallyas indicated by the rays 9, see Figs. 3 and 4.

The effect of the transverse corrugations is to direct the rays whichstrike these corrugations downwardly, as indicated by the rays 7 seeFigs. 3 and 5. It will be seen, therefore, that the range of the signalis considerably extended, both laterally and downwardly so that thesignal may be effectively observed whether the point of view is takenconsiderably to one side of the longi-' a specific form of device, I donot wish to be limited to such specific construction inasmuch as theprinciples of my invention are applicable to other modifications thescope of which invention may be readily determined by the claims herein.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is:

1. As an article of manufacture, a 'reflector in the form of a hood fora light projector, said reflector having longitudinal corrugations andtransverse corrugations.

2. In a light projector, a light source and enclosure for the source, anopening in the enclosure through which a beam of light may pass out fromthe enclosure, a reflector in the form of a hood for the opening, saidhood having one group of longitudinal corrugations extending along theforward part of the hood and a second group of corrugations transverseto the direction of the first group and located between the longitudinalcorrugations and the opening of the enclosure.

3. As an article of manufacture, a reflector in the form of a hood for alight projector said reflector having longitudinal corrugations andtransverse corrugations, the longitudinal corrugations arranged in onegroup on the forward part of the hood and the transverse corrugationsarranged in a group between the longitudinal corrugations and the rearend of the hood.

4. A traflic signal comprising a reflector, a source of light in frontof said reflector. and a hood over the front of the signal, said hoodbeing in the form of a concave reflector 1 In Witness whereof, I havehereunto set my hand this 16th day of January, 1925.

CROMWELL A. B. HALVORSON. Jr.

